66550505269 has 2 divisors, whose sum is σ = 66550505270. Its totient is φ = 66550505268.

The previous prime is 66550505239. The next prime is 66550505299. The reversal of 66550505269 is 96250505566.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (66550505239) and next prime (66550505299).

It can be written as a sum of positive squares in only one way, i.e., 42998999044 + 23551506225 = 207362^2 + 153465^2 .

It is a cyclic number.

It is not a de Polignac number, because 66550505269 - 2⁷ = 66550505141 is a prime.

It is a super-2 number, since 2×66550505269² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66550505239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33275252634 + 33275252635.

It is an arithmetic number, because the mean of its divisors is an integer number (33275252635).

Almost surely, 2^66550505269 is an apocalyptic number.

It is an amenable number.

66550505269 is a deficient number, since it is larger than the sum of its proper divisors (1).

66550505269 is an equidigital number, since it uses as much as digits as its factorization.

66550505269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430000, while the sum is 49.

The spelling of 66550505269 in words is "sixty-six billion, five hundred fifty million, five hundred five thousand, two hundred sixty-nine".